Restore Full Electrical Control to Your GM Truck or SUV
Are you battling persistent electrical gremlins in your Cadillac Escalade, Chevrolet Silverado, or GMC Sierra? Flickering lights, unresponsive power windows, a malfunctioning security system, or a dead HVAC blower are all classic signs of a failing Body Control Module (BCM). The BCM is the central command center for your vehicle’s body electronics, and when it fails, it can cause a cascade of frustrating and difficult-to-diagnose issues. This genuine OEM-quality BCM, part number 20939137, is the definitive solution, arriving pre-programmed to your vehicle’s specific VIN for a seamless, plug-and-play installation.
From the Diagnostic Bay
We had a 2010 Silverado 1500 come in with the strangest combination of symptoms: the radio would stay on after the key was removed, the driver’s side power window worked intermittently, and the HVAC blower was completely dead. The owner had already replaced the blower motor and resistor with no luck. After scanning the vehicle, we found a series of communication error codes all pointing back to one component. A quick check of the BCM’s data stream showed erratic voltage readings. We installed a VIN-programmed BCM, and within minutes, every single issue was resolved. These modules control more than you think, and a faulty one can send you chasing problems all over the vehicle.
Is Your Vehicle Showing These BCM Failure Symptoms?
- ✔ Unresponsive or erratic power windows, door locks, or interior/exterior lights.
- ✔ HVAC system failures, such as a blower motor that won’t turn on or stays stuck on one speed.
- ✔ An illuminated airbag warning light, often accompanied by DTC B1001.
- ✔ Security system malfunctions, including random alarm activation or a no-start condition.
- ✔ Intermittent stalling, misfires, or other performance issues linked to poor grounding data.
- ✔ A variety of communication-related Diagnostic Trouble Codes (DTCs) stored in the system.
The Plug-and-Play Solution: A Programmed 2007-2011 Escalade BCM
Don’t waste time and money at the dealership with expensive programming fees. We handle the complex part for you. By providing your vehicle’s VIN during checkout, you receive a module that is loaded with the latest GM software and calibrated specifically for your vehicle’s options. This ensures that all systems communicate correctly from the moment you plug it in. This module is a direct replacement for a wide range of part numbers, including 25844480, 25835966, 15943678, 20939138, and 22860591.
Installation and Post-Install Notes
Installation is typically straightforward. The BCM is located under the driver’s side dash, near the steering column. Simply disconnect the negative battery terminal, unplug the electrical connectors from the old module, remove it, and install the new one. While the module is plug-and-play for most functions, please be aware of potential post-installation procedures:
- Airbag System Sync: If the airbag light remains on after installation, a ‘Setup SDM Primary Key in BCM’ procedure is required. This must be done with a professional-grade scan tool and syncs the new BCM with the airbag system.
- Brake Pedal Position Relearn: Some models may require a brake pedal position sensor relearn to ensure proper brake light and traction control operation.
There is no core charge for this part. You can keep your old module without the hassle of returning it.
Frequently Asked Questions
What does a Body Control Module (BCM) do?
The BCM acts as the central computer for your vehicle’s body electronics. It manages functions not related to the engine, such as power windows, locks, lights, wipers, the security system, and the HVAC climate control system.
Is this module truly plug-and-play?
Yes, it comes programmed to your vehicle’s VIN, so it’s ready for installation without needing a trip to the dealer for programming. However, as noted, some vehicles may require a simple relearn procedure for the airbag or brake pedal sensor, which can be done with a capable scan tool.
What if my airbag light is on after I install the new BCM?
This indicates the new BCM needs to be electronically ‘introduced’ to the vehicle’s Sensing and Diagnostic Module (SDM). A procedure called ‘Setup SDM Primary Key in BCM’ must be performed with a professional scan tool to clear the light.
Where is the BCM located on my 2008 Silverado or 2009 Tahoe?
On most compatible GM trucks and SUVs from this era, the BCM is located under the driver’s side dashboard, typically to the left of the steering column.
Do I need to send my old part back?
No, there is no core charge on this module. You can keep or dispose of your original part at your convenience.